Erotic electrostimulation

Erotic electrostimulation (abbreviated erotic e-stim and also known as electrosex) is a sexual practice involving the application of electrical stimulation to the nerves of the body, with particular emphasis on the genitals, using a power source (such as a TENS, EMS, violet wands, or made-for-play units) for purposes of sexual stimulation. Electrostimulation has been associated with BDSM activities, and erotic electrostimulation is an evolution of that practice.

Source: Wikipedia — Erotic electrostimulation (CC BY-SA 4.0)